Furnace bridge wall



sept.. 11, 1923.

1,467,566 w. w. BOOTH f FURNAGE BRIDGE WALL Filed Deo. '16. 1921. 2 sheets-sheet 1 llIAl//lIIll/I/A/[A fll 3 sept. 11, 1923. 1,467,566

W. W. BOOTH FURNACE BRIDGE WALL Filed Dec. 1e. 1921 2y sheets-sheet 2 szw' Patented Sept. 11, 1923.

UNITED STATES WALLACE w. BOOTH, onBnoOxLYnnnw yonx.

FURNAOE BRIDGE 'wenn Application led December 16,`1921.- Seria1`No.l522,768.

To all lwhom t may concern.

Be it known that I, WALLACE W. BOOTH,`

a citizen of the United States, and a resident of the borough of Brooklyn, county of Kings, city and State of New York, have invented certa-in new and Vuseful Improvements in Furnace Bridge Walls, of which the following is a specification.

My improvements relatel to the so-called hollow sec-tional type of re bridges for furnaces,.in and through which air from the ash pit is heated and fed to the fire box; and are designed to attain simplicity ofconstruction; a maximum of internal l heating surface and positive ltortuous air contact Fig. 1, is a transverse section of a. furnace flue showing my improved bridge wall construction in front elevation; l

Fig. 2, is a front view, on a larger scale, of the two end sections, and two of the intermediate sections, of the upper portion of the bridge wall structure; a Fig. 3, is a transverse section of the bridge wall structure, taken upon plane of line 3 3, Fig. l, but upon a larger scale;

Fig. 4, is a transverse section of my bridge wall construction like unto that shown in Fig. 3, showing a' bridge top section positioned to resist displacement by frontal pressure;

Fig. 5, is a like section showing the 'func-- tion of the interlocking parts in preventing top section displacement by rear pressure thereon;

Fig. 6, is a front view, on a reduced s cale, of the basic bridge supporting `partition plate, with one half of the bridge shelf in position thereon; y l

Fig. 7, is a sectional detail ofthe other half of the bridge shelf, taken on `plane of line 7 7 Fig. 9;

Fig. 8, is a horizontal section of a portion -'medial .top bridgel sections, taken .upon

. of a'corrugated furnace tube,'showing a plan of the bridge shelf, the bridge top sections being omitted; i f

` l 1,463,555 frnraur f oFFlc Fig. 9, isa transverse sectionof thefbridge shelf, taken upon plane of line 99,'Fig. 8;

Fig. 10, is a side elevation of one of medialy bridgetop vsections Fig. y1l, isafrontelevation'thereof; Figlf 12,"is a section of two adjoin-illilg t e planes ofline 4.Hf-12, Fig.l v10; 'i Fig. '13, is va sectional ldetail of the rear portions-Of -vadjacent bridgetop sections,

`showing a modification in the overlap Y `In'the drawings F, is used to designate a portion ofacorrugated vcylindrical furnace flue ofwell 'known form and construcl tion,;in the lower part of which the bridge: z

the *y Wallis installed, saidbridge wall consisting essentially; of a basic foundation .plate.lB,

which also partitionsoff the ash pit A, from the rear portion `of the furnace ue F, asl shown moreparticularly in Fig. l3, ofthe drawings, and in this'respect functions also as awbaflle'yvof `the bridge` shelfrSsecured to saidbasic supporting partition B'; and of a series of bridge top sections C, C, demountably `positioned on said bracket shelf S.4

The` basic' partitionplate B, vis formed l with frontand rear feetilanges b, b, which. conform, to the r'corrugated bottom `,of

frontal bracket lugs l5, `of the bridge Shelf The latter may bev made in `one or, morev divisionsas rmay be found most expedient in practical application. --As shown v in the drawingsit is made of two ldivisional por-v tions,fthe conjunctive cross ribs s, s, .of which are bolted, together, as indicated in Figs. 3 and 8'. The yshelf S, considered in a unitary sense, is also rigidly attached to the, upper part of the basic partition Byas by bolts shown in 8 to 5 inclusive. The forward edge of'said'pshelf .is formed with a -flanged vledge s* for'the support of the rear endsy o'f the gratebars (g) as 4indicated inv Fig. ,3,

'the uelFv as ShQWIl in Fg- 3, and alsoywtllfr ,for the supportl in amanner well known in the-prior state f of theart'. The top of the shelf is formed with" parallel bearing surfaces s', s?, consti tuting rests. forv the demountable top sec,-`

surface's" s", s2, extending ina commonhori- 4'zontal plane, except that the rea-r rest'sis slotted longitudinally v(as shown at .921,

ltionsy C, C, of the fire bridge,-these bearing 8, particularly) and is furthermorey provided with a longitudinal shoulder 822, for con# tactual engagement, under certain conditions with the heels of the bridge top sec-V tions C, C, as hereinafter'set forth. Be#

tween the front bearing surface s', and the rear bearing surface s2, thereof, the shelf S, is open for the pasage of air from the ash pit A, except where the cross ribs s, s, occur, which said crcss ribs s, s, rigidly connect the longitudinal members of. the shelf S, and, as will be understod more particularly by reference to Fig. 8, taken in conjunction with Figs. 3, t, 5 and 9,-the upper edge of the basic partition B, being formedvwith recesses b2, b2, for the accommodation of the cross ribs s, s, as indicated in Fig. 6. may be noted, `in this connectiomthat the shelf S, while rigidly attached to the basic partition plate is integral in structure,

and has no projection above its bearing sur- I faces s', s2, other than the'rear shoulders.

Thus the bridge top sections C, C, are installed .on the fiat in so far as the shelf- S, is concerned, and are not suspended nor dependent upon rear plate or wall support lofany lkind, which is a great practical advantage as compared with the prior'state of the art,- because of simplicity of structure and facility of manipulation.

All the demountable bridge top section are vof arcuate"configuration, their frontal surfaces being convexly curvilinear, so as lto afford anl upwardly recedent barrier for'the support of thefuel at the rear of the grate" bars. They, are all alike in this respect,

even the end sections C', C which yare shaped' to conform; to the adjacent 'inner side walls of the furnace F Each'intermediate section C, is formed with a vmedial web c, of less thickness than the face ange c, thus creating recesses c2, at the rear'of.

said face flanges c and theserecesses 02 are sudo-divided by a plurality ofl lateral baffle flanges c3, c3, on opposite sides of the web c, the baille flanges c3, on one `side of the web'c, intervening in position as related to those on the under side thereof, so that' when the sections C, C?, are mounted side by sideon the shelf'S, tortuous passages are created between adjoining sections, as shown The lower extremity of the rear member o r lego, of each top sectionC, is formed with a foot c5, broader than the width of the slot S21, in the shelf S, so as to rest and bear C, during use by reason of undue frontal o r rear pressure, as by'push or pull of a grate rake carelessly or unskillfully handled. i

Thus, if the pressure or blow is against the faceA of the' sectionl C, thev latter may be forced back until the foot c",bears against the shoulder .922, at the lrear of the shelf S,

as shown in Fig. et, but can ybe forced back-l' wardrno further; whereas a pullexertedr against` the rear member or leg 04, of the section C, will be counteracted by the engagement of the toe c6, with the rear wallL of theslot 822, as illustrated in Fig. 5, thereby obviating displacement.

`In order to preventthe air from the ash pit from passing direct to and through the f upper ejector passages4 1, 2, and 3, and'to insure 'its' passage thereto through theV tortuous passages Vcreated byy the l baille. f

Vflanges ci, c3, as hereinbefore stated, I'forrn each web c, with inclined flanges c7, extend# e ing from the upper part of the rear member or leg c4, of the section to below the lower baffle flanges c3, (see particularly Fig. 10), said inclined angcs c7, performing the additional function ofv acting as shields to protect the slot S21, and the aforesaid inter- ,j locking means, from clogging, by ash descending through the air passages 1. 2 and 3.v

The continuityof the slots, admits Vof 1 the lateral adjustmentfofV the ybridge top -sections C, as related` to eachother, and facilitates their individual and collective' installation or removal and replacement, as they are free to be raised or loweredin-A ldividually in a vertical direction. i

In order topractically seal thejoin'ts'be-` f tween` adjoining leg rmembers c4, of thel 'y sections C, without impeding this, freedom of individual vertical movement of the sections, I form said leg members c, with overs Vlap` side flanges c41which-close the lines. of juncture, as indicated in Figs. 12 and 13,

the latter showing a inodiication of struc- `The tortuous air passages'created by the the saidf sections by reason of augmented tur@ in this respect as compared with Fig. i

area of contactual surface for the'air drawnl Y from the ash pit, thereby practically superheating said air and rendering its constituents highly nascent before injection into and through the fuel on the continuous front of the said bridge top sections, so as to promote the complete reduction of the oxidizeble products of combustion before they pass the bridge Wall, thus eliminating smo-ke, and avoiding loss of heat units, but said deflectors c3, also tend to prevent the overheating of the sections for a like reason,-i. e., they increase heat diffusion. Furthermore, they reinforce and stiifen the Webs c, against any tendency to Warp When subjected to a high degree of heat.

Vhat l claim as my invention and desire to secure by Letters Patent is,

A furnace bridge wall of the character designated, comprising a base partition, a shelf mounted thereon and formed with parallel bearing surfaces with air passages therebetween, and With a frontal ledge for the support of the rear ends of the grate bars, said shelf being also formed with a flangeless longitudinal rear lock slot open and of uniform Width from one end of the shelf to the other, and With a back rest parallel thereto7 and a .plurality of independently demountable bridge top sections having overlapping vertical side flanges, and with face flanges having coincidental edge recesses, each section having a central web of less thickness than the Width of its face flange, with baifle flanges on each side of said Web, and deflector flanges therebelovv, each section having a rear leg member formed with heel shoulders contacting with said shelf, and with a toe extending through said lock slot in said shelf, substantially in the manner and for the purpose set forth.

WALLACE vv. Boo'frrr.

Witnesses:

GEO. WM. MIA'IT, DOROTHY M. GARMICHAEL. 

